README.md

What's it all about?

Headroom.js is a lightweight, high-performance JS widget (with no dependencies!) that allows you to react to the user's scroll. The header on this site is a living example, it slides out of view when scrolling down and slides back in when scrolling up.

Why use it?

Fixed headers are a popular approach for keeping the primary navigation in close proximity to the user. This can reduce the effort required for a user to quickly navigate a site, but they are not without problems…

Large screens are usually landscape-oriented, meaning less vertical than horizontal space. A fixed header can therefore occupy a significant portion of the content area. Small screens are typically used in a portrait orientation. Whilst this results in more vertical space, because of the overall height of the screen a meaningfully-sized header can still be quite imposing.

Headroom.js allows you to bring elements into view when appropriate, and give focus to your content the rest of the time.

How does it work?

At it's most basic headroom.js simply adds and removes CSS classes from an element in response to a scroll event. This means you must supply your own CSS styles separately. The classes that are used in headroom.js that are added and removed are:

Relying on CSS classes affords headroom.js incredible flexibility. The choice of what to do when scrolling up or down is now entirely yours - anything you can do with CSS you can do in response to the user's scroll.

Usage

Using headroom.js is really simple. It has a pure JS API, plus an optional jQuery/Zepto plugin and AngularJS directive.

Install with npm

npm install headroom.js --save

Install with bower

bower install https://unpkg.com/headroom.js/bower.zip --save

Using Headroom.js with a CDN

A universal build (suitable for script tags, CommonJS, and AMD) is available from unpkg.com:

Note: in AngularJS, you cannot pass a DOM element as a directive attribute. Instead, you have to provide a selector that can be passed to angular.element. If you use default AngularJS jQLite selector engine, here are the compliant selectors.

Options

Headroom.js can also accept an options object to alter the way it behaves. You can see the default options by inspecting Headroom.options. The structure of an options object is as follows:

Browser support

All of these APIs are capable of being polyfilled, so headroom.js can work with less-capable browsers if desired. Check the linked resources above to determine if you must polyfill to achieve your desired level of browser support.

Contributions & Issues

Contributions are welcome. Please clearly explain the purpose of the PR and follow the current style.

Issues can be resolved quickest if they are descriptive and include both a reduced test case and a set of steps to reproduce.